Filter Cake Build-Up and Backwashing
Particle deposition by sieving, filter cake build-up and re-entrainment of deposited particles and agglomerates can be simulated by high-precision resolved 2-way CFD-DEM coupling. By this method, the flow field around each single particle is resolved and the forces which act on a particle are computed by integration of pressures and relative velocities over the particle surface. The effect of the particles on the fluid flow is taken into account by velocity boundary conditions on the particle surface. By this, volume displacement and momentum transfer from the particles on the fluid are reproduced.
As a less computationally intensive alternative to 2-way CFD-DEM coupling, 1-way CFD-DEM coupling is also available in DNSlab, where the effect of the undeposited particles on the flow is neglected. Thus, the computational effort for the flow calculation can be substantially reduced. At the same time, a wider particle size distribution can be mapped.
Publications on Simulation of Filter Cake Build-Up and Backwashing with DNSlab Zhang, Q.; Horst, D.; Schmidt, E.: Evaluation of Tensile Adhesion Strength in Simulated Dust Cakes on Fabric Filters. Chemical Engineering & Technology 44 (2021), no. 2, pp. 359-364 DOI: 10.1002/ceat.201900541
 Puderbach, V.; Schmidt, K.; Antonyuk, S.: A Coupled CFD-DEM Model for Resolved Simulation of Filter Cake Formation during Solid-Liquid Separation. Processes 826 (2021), no. 9, pp. 1-22 DOI: 10.3390/pr9050826
 Schmidt, K.; Puderbach, V.; Antonyuk, S.: 1½-Way CFD-DEM coupling with DNSlab: The optimal compromise between modeling depth and computer resources demand for the 3D simulation of microscale fluid-particle-processes. FILTECH 2021 Proceedings
 Zhang, Q.; Horst, D.; Schmidt, E.: Modellierung der Oberflächenstruktur von Nadelfilz-Filtermedien zur Simulation der kuchenbildenden Staubfiltration. Chemie Ingenieur Technik 92 (2020), No. 3, p. 275–281 DOI: 10.1002/cite.201900116
 Puderbach, V.; Schmidt, K.; Antonyuk, S.: Numerical and experimental investigation of filter cake formation during solid-liquid separation by resolved CFD-DEM coupling. FILTECH 2019 Proceedings
 Hund, D.; Schmidt, K.; Ripperger, S.; Antonyuk, S.: Direct numerical simulation of cake formation during filtration with woven fabrics. Chemical Engineering Research and Design 139 (2018) p. 26-33 DOI: 10.1016/j.cherd.2018.09.023
 Schmidt, K.; Hund, D.; Ripperger, S.; Antonyuk, S.: Coupling of the Lattice-Boltzmann method and the discrete element method to model the separation of solid particles from liquids by porous media. FILTECH 2018 Proceedings
 Hund, D.: Methoden zur Simulation der Kuchenfiltration. Doctoral thesis, TU Kaiserslautern, 2018
 Hund, D.; Schmidt, K.; Ripperger, S.: Numerische Berechnung der Strömung und Partikelabscheidung in Filtrationsgeweben. Filtrieren und Separieren 28 (2014), No. 4, p. 221-225